Elevator safety device.



H. T. SCOTT.

ELEVATOR SAFETY DEVICE.

APrfLlcmoN mso MAR. 29. 191s.

Patented-Aug. 28, 1917 2 SHEETS-SHEET l.

nuanboz emy oot H. T. SCOTT.

ELEVATOR SAFETY DEVICE.

APPLICATION'FILED MAR. 29. |916.

1 ,238,346. y Patented Aug. 28, 1917.y

2 SHEETS-SHEET 2.

Summa;

UNITED sTATfEs PATENT oEEroE.

HENRY THOMAS SCOTT, OF FRANKFORT, KENTUCKY.

ELEVATOR SAFETY DEVICE.Y

To all whom z' may concern:

Be it known that I, HENRY T. SCOTT, a citizen of the United States, residing at Frankfort, in the county. of Franklin and State of Kentucky, have invented new and useful Improvements in Elevator Safety Devices, of which the following is a specification.

This invention relates to safety devices especially adapted to be used upon elevators and it consists in the novel features heremafter described and claimed.

An object of the invention is to provide a device of the character indicated which is automatic in its operation to bring the elevator to a stop in its shaft in the event that the supporting cable should break or should become suddenly slack from any cause.

Vith the above object in view the device includes wedge shaped slices movably mounted at the ends of the beam of the elevator and connected by a series of links with the cable block which is mounted upon the elevat-or beam. Springs are attached at their outer'ends to the undersides of the beam and at their inner ends engage the said cable block and are adapted to move the said block suddenly in a .downward direction in the event that the supporting cable is broken or becomes suddenly slack whereby the said shoes through the links are forced into frictional contact with the guides in the ele vator shaft and the bar is brought to a state of rest. The parts are so arranged that as soon as a pulling strain is exerted upon the cable block and the same is moved in an upward direction with relation to the beam the said shoes are withdrawn from their frictional contact with the guides and the elevator car is free to move along the shaft in the usual manner.

In the accompanying drawings Figure 1 is a side elevation of an elevator' car showing the saine in position between the guides of the elevator shaft and having the safety device applied.

Fig. 2 is a detail view of the safety device showing the shoes spaced from the guide.

Fig. 3 is a similar view showing the shoes in frictional contact with the guide.

Fig. i is a transverse sectional view of the same cut on the line T T of Fig. 1.

Fig. 5 is a similar view cut on the line 5 5 of the same figure.

Specification of Letters Patent. Patnted Aug; 28 191'7 Application filed March 29, 1916. Serial No. 87,535.

Fig. 6 is a perspective view of a trailer used in the device.

Fig. 7 is a similar view of a block used in the device.

Fig. 8 is a detailed sectional view cut on the line 8 8 of Fig. 1.

The elevator shaft is provided at its opposite sides with guides 1 of usual form. rIhe car which is arranged tomove between the said guides includes in part a cross beam 2 which is longitudinally slotted at its underside as at 3. The said beam 2 is provided at its intermediate portion with a recess a which enters the slot 3 and an opening 5 communicates at its lower end with the recess et and extends to the upper edge of are provided with pockets 8 which lit snugly in the upper portions of the recesses 6. The pockets 8 are provided with upper inclined walls 9 and slots 10. A cable block 11 is mounted at the intermediate portion of the beam 2 for limited movement transversely thereof and the end of the hoisting cable 12 is attached to the upper portion of the block 11. The lower intermediate portion of the block 11 extends under and across the intermediate portion of the beam 2. A bar 13 is attached at its upper end by means of a pin 1d to the upper portion of the cable block 11 and the said bar is slidably received in the opening 5 provided at the intermediate portion of the beam 2. Links 15 are hingedly connected at their inner ends to the lower portion or' the bar 13 and are arranged to move within the recess 4L in the beam 2. Links 16 are hingedly connected at their inner ends to the outer ends of the links 15 and are arranged to move along the slot 3 at the lower portion of the beam 2. Links 17 are hingedly connected at their inner ends with the outer ends of the links 16 and the said links 17 pass through the slots 10 and are hingedly connected at their outer ends with shoes 18 which in turn are movably mounted in the pockets 8 of the trailers 7. The shoes 18 are provided with inclined sides or surfaces 19 which are adapted to engage the inclined sides of the pockets 8 when the said shoes are moved within the said pockets. Flat springs 2O are secured at their outer ends to the underside of the beam 2 in the vicinity of the inner ends thereof and the inner portions of the said springs 2O engage the intermediate portion of the cable block 11 as shown in Figs. 2 and 3 of the drawings.

llhen the elevator is in perfect running order the parts of the safety device are in the positions as shown in Fig. 2 of the drawing wherein it will be seen that the cable 12 sustains the weight of the beam 2 and the parts connected therewith whereby the intermediate portion of the cable block 11 is held up toward the lower edge of the beam 2. This maintains the bar 13 in an elevated position in the opening 5 and consequent-ly the links 157 1G and 17 hold the slices 1S out of contact with the guides 1 of the elevator shaft. Thus the elevator car is free to be moved up or down along the elevator shaft. 1n the event that the cable. 12 should break or suddenly become slack from any cause the tension of the springs Q0 will immediately comeinto play whereby the cable block 11 is moved in a downward direction with relation to the beam 2 and the bar 13 Ais similarly moved. Through the downward movement of the bar 13 the links, 15, 1G and 17 are moved longitudinally whereby the inclined sides 19 of the shoes 18 move along the inclined sides 9 of the pockets S and the outer surfaces of the said shoes 1S are forced into frictional contact with the guides 1 whereby the car of which the beam 2 is a component part is brought to a state of rest and is prevented from falling down the elevator' shaft. The shoes 1S may be made of any suitable materi al and if desired the outer surfaces thereof may be roughened to afford ample frietion to bring thel car to a state of rest in the event of an accidentl as stated without sudden jar or damage to the car or parts of the elevator shaft.

From the foregoing description taken in conjunction with the accompanying drawings it will be seen that a safety device especially adapted to be'used on elevators is provided and that the same is automatic in its action to bring the car to a state of rest in the event that the hoisting cableis broken or becomes disarranged or suddenly slack. llurthermore it will be seen that as soon as the hoisting cable is properly connected with the cable block and a pulling strain is exerted through the cable upon the block the part of the safety device will automatically release the car whereby it may be freely moved along the elevator shaft.

Having described the invention what is claimed is :n

1n combination with guidesiand a car mounted for movement along the same7 a beam carried by the ear, trailers tiXed at the ends of the beam and movable along the guides, said trailers having pockets located between their ends, said pockets being provided with upwardly and out iardly inclined walls7 said pockets also being provided with slots located at their deepest points, shoes movably mounted in the pockets and having inclined sides adapted to move along the inclined walls of the pockets, a cable block movably mounted on the beam and connected with the working cable of the car, a bar attached to the cable block and entering the beam7 links located. within the beam and passing through the slots of the pockets and connecting with the bar and shoes7 and a spring mounted upon the beam and engag ing the cable block and adapted to move the same in a downward direction in the event that the hoisting cable becomes slack.

In testimony whereof I .atlix my signature in presence of two witnesses.

HENRY TIflOMAS SCOTT. TWitnesses 1V. C. CAYwooD, J. 1V. RoBnrJrs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner oi Patents Washington, D. C. 

